Fastener



Patented Sept. 13, 1949 -livjer "Iron and Steel Corporation, Pittsburgh,

sPa., `a. lcorpmentionot Pennsylvania ARnliention-Angnstt; 1946., No.. 88,529y

t maints.

The .present .inyention relates to .e .festenine device for holding together .two or more rnernhersy 0l' .fdr Preventing a member from splitting into several-perte., or for securing together parts 0i .one or .more members .which .have .elreedy started to creek or split.

Cee.nerelly speaking, the .fastener which I provide comprises twoxseperate parts, which are hereluefter referred to esgrips, adapted to be inserted from opposite ends of e 'previously prepared hole in the member .or members end to lie in pertielly overlapped relationshipin the hole. As the grips are placedV in the hole, they lslide .,a, variable distsnce. nest eeeh other .nntil the enlarged end .or heedv on the outer end oi eechgrip. :thrusts against the outside .or vthe member to which .it .is being applied. iileoh grip .hes .serrated teeth formed epproxiineteiy trensyerseiy tothe exis. of .the .grip and. elsingv vone side,v .end when .the ends 'or the grinsV .ere overlapped .in the hole, ...tiie'teeth on the grins. engage eeen .other end prevent Vsnbseii.nent seperetion of the grips. .In fastening, two or more, timbers. which .are ,somewhat sepereted, or in .closing existing. .creeks in timbers. the. thrust reqnired to close the creeis eiso be iised to forcethe Opposing .grips into overlapping relation.- siiip. Whenthepressnre-is releesed the .engeged teethoi thetwo grips prevent the creeks or .sepas retiens from opening.- The grips een beroerde oi' any meteriei, v.but erepreierebiy. inode oisteeh iron, or enen-terroirs Inetoigl ltlis inereiy neees.-

sert' that the. grips be nitide. o f. a., mnterieihevipg.

sufcient tensile strength to withstand the fogrces tending. to puiltheni eport.. v

Itisfnot .thet the twogrips .comprisingapair be oftheseme length... 'I'heshenkfportiorisfof. the gripseen be yeriediniengthso thet. two lengths of grips. ceri be. usedto .festen .obieets- .A .further verietion in o f. .many thicknesses thiolsnessof the objects .seenred is permitted by reason of the feet thetthegrips moy overlep over the entire toothed portion` or lover only e pert of! the topf/hed portion., Ans. Willbe 4e,ploatreii,t from;v

the specific description set forth hereinafter, the.

grip whichl I provide is. designed so. inet. when. only e few teethere engaged, thev .ful-l.v strength.

of .the -festenerv .is developed..

In. the. accompanying. drempel. have. shown., for purposes of illustration only, a preform@ gm,

bodirneint` of. my intention. In. the dreiving.

Eleure. .lis sectionthroughetiinber withthe. grips-insertedintiie hole through thetimber, but.y

not in grippingV position;

.Figure `.2 .is `srvievr similar to .Eigiire .1., with.. the. grips.fdriyenfintorestenine oyerieppipg position? '.Fignre Slis .e side yievvoi .one ofthe grins. embodying .my invention;

l".i.gure i is e top view ofthe grip iliustreted Figure .3.; and Figure 511s .e .section teken elong .the line V'-.V of Figure 3,..looking in the direction. of the .errori/.s-4

As shown ,in .the drawing., .the festeiier which I" provide comprises .e peir oflgrips iledepted tribe:

inserted .from opposite .ends into .e hoile t .enteriti-` ing through the timber 41 to. be reiniorcedl: .Each

grip hes e shank portion. ,5.; einergeililitetiiii;`

e. toothed section .l and eteperedineclr portion .8' extending between the .shenlrportien .and .the ene lergeel' heed li The toothediseotion :l .hns spine relity of teeth iiy thereonend these teeth .are sprovided with .e beekwerdjslent .the .epgegine .feces Ic ofthe teeth beinginelinediiprverdiy .toward the. heeded end ofthe grip.. beek-.relie of the teeth senses .tiny .longitudinal separating. force to Ineke. the teeth engege .more teneoionslit The toothed .portion .oi .the-.grip e. flot., teperedend" il, thetwhenthetwogrins ere forced toward. .eeen other .in the ho.le.,. .the teeth thereon will become. properly eligned'- '.Ihe normeldiemeter of the toothedlseetionis preferably .less .than the diameter of the .shepir portiini..V

Byfnorrnel: dieineter .meent the diameter o f the toothed section before. ity is. ettened .in the .for-

mation oftthe teeth.- .it is. also the dierneter of" the toothed. seetion Where it joins the nention of the grip. The normardaineternof. enen toothed section is sncln thet when the twofletteiied toothed portions lie in overlapping relistionship, the. eornbineddiemeter oi the oyerieoping toothed sections is 4grenier then .the die' emeter .oi-each .grin

The. relationship be sheiili portion .end the norrnel didrneter oi'tiie. toothed sentieri. mentioned. .above is .not .neeessery to.. e proper .innetionine of' the iestener.- 1i" el relatively smell heed .is .required-on oithe. gripsthe Vof the .stools .from which .tliezgripsl ereforrnedfniey be of'such diameter esV to. .nitrite it undesireble or `to the.` toothed!` illustrated .Figure .2, the. .eplerged' `heed ebiitsl theediecent fece .oithe timber when the grip.s. are fenced. into. .oyeriepping relationship.. The..

inpenieoeoi. the heedoi the .grip is proilided'with. apeyei @which inert be .forced'intothe ixnben,

provided. .withl the. dieineter of the to some extent, so as to provide a seal for the hole in which the grip is positioned. This seal prevents water from getting into the hole through the end thereof and, hence, reduces the corrosion action on the fastener.

Between the enlarged head and the shank portion, eachgripf-has a tapered-.neck ,portion 6. y The meandiameterof thisneck portion' is greater than the diameter of the shank portion, but less than the diameter of the head. The diameter of this neck portion increases from the shank to-` ward the head. The diameter of the neck portion ly,A` and that it will securely and permanently hold together two or more parts or reinforce a member so that it will not split. It will also be closest the head should be as great as, or slightly` greater than, the hole into which the gripv is to be placed. By providing a Very close iit .between a part of the neck portion and the hole, a further` sealing action can be obtained. In addition,`this"' seen that the fastener which I provide can be readilyy applied without the use of special tools.

. While I have shown and described a preferred embodimentof my invention, it will be undertapered neck portion performs the importantv Y function mentioned below.

`As will be noted in Figures 1 and 3, the longitudinal axis of the toothed section ofthe grip extends. angularly .in relation to thelongitudinal axis of the shank. This bend in the grip is pref-, erably formedL near the end of the toothed por? tion .closest the shank portion. This angular relationshipprovidesa more positive interlocking of the teeth thancould be` obtained otherwise, Jas it provides a side thrust which is effective'between,

' stood that itcan be otherwise embodied within thescope of the appended claims.

I claim: A fastening deviceV comprising a pair. of

gripsadapted lto beinserted'from opposite fenisVv into a hole -extendin'grthrou'gh the'members ,tofbegl securedA or reinforced, and to lie in p'artia1ly,oyer

. lapped relationshipin, the hole, eachA of said' grips theV toothed portions when the grips are driven` into position in the hole. This side Athrust, is

other to parallel the hole, as is illustrated in lig,

ure 1. 'When in this position, the shankI portions f are not parallel with the hole and they donot bef.l

come parallel with the hole until the t'w'o, grips are driven into the positonillustratedin Figure" 2.,] When the tapered'neck portion ,enters vkthe hole, the shank portion is forced to vbe practically 1 concentric. with the hole and this forces the toothed portions'to mesh' tightly in the bending action which tends .tdstraighten out the angle' between the toothed ,portionand theshankpor-V tion ofy each grip. bending actionvis obtained between Vthe, heell of thetoothed .portion which contacts ,one side of the holeand that portion ofthe taperedV neck which bearson the opposite Side', 0f .the hole.

4,Asisfstated above, the'grips :may: be formed of jany .material having the necessary "tensile strengthbut are preferablylmade of,', steel. In the manufacture of the grip, a blank o f'substa'n'- produced vby thetapered neck portionlunder the L headincombination with the angular` position or" 1 thetoothed Vportion in relationto the axis'of the] shank. When the ends ofthe toothed portions. meet inthe hole in thetimber, they force each.

tiallythe nal shank diameter is used.,l ,The blank v is rst headed,and, at the Sametime, the/tapered or neckportion'is formed. The endto be ltoothed is then extruded soas to reducefthe diameter and.'

increase the length thereof.' The'endfoffthe ex-y trudedportion is thenpointed or beveled. The extruded portion is then placed between dies and the teeth forme,d. At the/same time that the teeth are formed, lthe diameter of the toothed section in the directionof the faces of the teeth isv increased so thatwhen the twoY toothed sections are put together, the total diamet'er'thereofV will be greater than that of the shank and will iit closelythe circumference ofthe hole.v At the same time that the teeth are formed,ithe grip is bent to provide the angular relationship 'be tween the longitudinal axisQof the toothed sec tion and the longitudinal axis of the shank. Flor; economy of ,manufacture .it is importantjthat the.' extruded diameter be small enough tof permit having a shank portion, an enlarged head at one endof, tlieishank portion, said ,headhaving a` diameter greater thanfthediameter o f the shank portion, and ailattened toothed section at-the other end of the shank portion, said section having a plurality of teeth thereon, the longitudinal axisfofthe toothed ,section extending angularly in relation to the .axisl ofthe shank in the di non inwmch the 'teeth face. 'Y

V2.. .A fastening device comprising a pair of adapted toY be insertediromv opposite .ends ,into

a hole extending through the ,members lto bese'e cured or, reinforced andato lie in partially overlappedrelationship in the hole, each of said grips having va, shank portion, Aan enlarged. head atene4 n end ofthe shank portion,said, head, having" diameter greater than the'diameter of the shv portion,' a flattenedt'oothed section attli'f,other'I v end o'ffthe shank portion, said toothed 'sectiorrl f i having a plurality of teethV thereonand.a tapered Q neck portion extendingbetween the enlargedf head,'andthe shank portion, the meari'diametr of the `:neckjportiorl being greater than the', diameter oftheI shank prtion,the neck portion increasing 'infdiametenfrom the shanktoward the llegada, thel longitudinal axis of the toothed; sectionv extending angularly in relation to' thef axis ofthe shank in the direction in Whichthle,l

teeth face.'

3. A vfastening device comprising apair of grips adapted to beinserted from opposite ends'in'to, a hole extending `through Ythe memberstojbe sel-."2 cured o'rfreinforced, andto lie in partiallyoverlapped .relationship in the hole, each of said gripslhaving a'vfshank portion, an 'enlarged headat oney endl'fof 'the shank portion, said-A head 'having a diameter greater lthanlthe diameter of theshanlk" portion, and a toothedsection at :the othervendl of the shank portion, said section having .thereon a plurality ofA teeth extending angularly 'upward ly toward the enlarged head to provideV a backk rake of the' teeth,`the longitudinalv axis of the" toothed section extending angularly'in relation to the axis lof the shankin'the Vdirection in which` the teeth face. y Y, 4. A fastening device comprising a pair of grips adapted to be insertedfr`om opposite' VendsiintoAV a hole extending through the members to l beljsief-f,

cured or reinforced andtollie in'partiallyover-k lapped relationship` in the hole, each .of said grips having a-shank portion, an enlarged' head atene" rec-v end of the shank portion, a toothed section at the REFERENCES CITED other end of the shank portion, said toothed secv tion having thereon a plurality of teeth, the faces lrlf ftuugwltgererences are of record m the of which extend angularly upwardly toward the p enlarged head, and a tapered neck portion ex- ,-3 UNITED STATES PATENTS tending between the enlarged head and the shank Number Name Dante portion, the mean diameter of the neck portion Re 20 485 MacLean Aug 24 1937 being greater than the diameter of the shank 82h77 Hardin Jun; 31 1883 portion, the neck portion increasing in diameter l 337807 Wightml Apr 20 1920 from the shank toward the head, the longitudinal Li) 2011551 Welk May' 21 1940 axis of the toothed section extending angularly in relation to the axis of the shank in the direction in which the teeth face.

CHARLES D. OVERLY. 15 

